篇名:
台灣牛隻發生新孢子蟲流產症An Abortion Storm in Cattle Associated with Neosporosis in Taiwan
作者:
黃久珍;丁履紉;蕭終融;陳美珠;黃鴻堅
中文摘要:
台灣某乳牛場18頭牛發生急性新孢子蟲感染症,流產胎兒約3-8月齡。該場流產期間以間接螢光染色法檢驗38頭流產母牛血清的新孢子蟲抗體包括IgG和IgM抗體,結果其中52.6% (20/38) IgG和IgM兩種抗體皆呈陽性、13.2% (5/38) 僅IgG抗體陽性、10.5% (4/38)IgM抗體陽性。該場在發生流產前新孢子蟲抗體為陰性,之後23/38牛隻血清新孢子蟲抗體發生陽轉現象。由於在檢測時流產牛隻僅IgG或IgM其中一種抗體呈陽,所以建議在診斷新孢子蟲症時,必須同時檢測IgG和IgM抗體。同時建議小牛需進行新孢子蟲監測。
英文摘要:
An abortion storm associated with acute neosporosis involving 18 cattle was observed in a dairy farm in Taiwan. Aborted fetus age ranged from 3 to 8 months. Of the 38 cattle in that farm examined during the abortion storm, 52.6% (20/38). 13.2% (5/38) and 10.5% (4/38) contained both IgG and IgM, only IgG and only IgM antibodies to Neospora caninum, respectively. No antibody to N. canimum was detected prior to the abortion storm. Follow-up study conducted a year later showed that 23 out of 28 cattle had seroconverted. Since some cattle were positive to either only IgG or IgM, we suggest that both IgG and IgM should be tested for diagnosing neosporosis. Neosporosis surveillance of naive cattle herd is recommended.
備註:
年份:西元 2003 年
期別:第 39 期
詳細內容:
Neosporosis, caused by the protozoan parasite, Neospora caninum, has been recognized as a major cause of abortion in cattle worldwide. It produces great economic loss because the aborted cow failed to produce milk if the abortion occurred in heifer [6]. It may also bring about the death of the infected newborn calf after parturition [8]. Seropositive cows have three times greater risks of abortion than seronegative cows [12]. Mainar-Jaime et al. [16] reported that 38.7% of the abortions in northern Sparin, while Kim et al. [15] confirmed that 21.1% of the cattle abortion in Korea, were attributed to N. caninum. Nevertheless, the difficulty in diagnosing N. caninum-associated reproductive failure is that many of the aborted fetuses were not available to the veterinary diagnostic laboratory, and thus, diagnosis of N. caninum as the causative agent of abortion is often based solely on assaying the cow sera for the presence of antibodies. Abortion storm in cattle probably due to neosporosis had also been reported in Germany [11]. We reported herein an abortion storm in a dairy farm in Taiwan that was probably free of N. caninum infection before the episode and discussed the various possible factors that might have contributed to the event.
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附件名稱:
台灣牛隻發生新孢子蟲流產症
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